Excess volumes related to the process of forming a spherical cavity in water were used to obtain the excess number of solvent molecules at the accessible surface. The expression presented in a previous work to describe the scaling of this property with the cavity radius has been revised. In particular, changes were introduced in order to agree with results from scaled particle theory in the limit of very small cavities. This expression enables one to obtain equimolar radii and, after free energy calculations, the surface tension at the equimolar surfaces. The effect of the excess volume errors on these properties is discussed.
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